1/*
2 * Copyright (C) 2000, 2004, 2021  Maciej W. Rozycki
3 * Copyright (C) 2003, 07 Ralf Baechle (ralf@linux-mips.org)
4 *
5 * This file is subject to the terms and conditions of the GNU General Public
6 * License.  See the file "COPYING" in the main directory of this archive
7 * for more details.
8 */
9#ifndef __ASM_DIV64_H
10#define __ASM_DIV64_H
11
12#include <asm/bitsperlong.h>
13
14#if BITS_PER_LONG == 32
15
16/*
17 * No traps on overflows for any of these...
18 */
19
20#define do_div64_32(res, high, low, base) ({				\
21	unsigned long __cf, __tmp, __tmp2, __i;				\
22	unsigned long __quot32, __mod32;				\
23									\
24	__asm__(							\
25	"	.set	push					\n"	\
26	"	.set	noat					\n"	\
27	"	.set	noreorder				\n"	\
28	"	move	%2, $0					\n"	\
29	"	move	%3, $0					\n"	\
30	"	b	1f					\n"	\
31	"	 li	%4, 0x21				\n"	\
32	"0:							\n"	\
33	"	sll	$1, %0, 0x1				\n"	\
34	"	srl	%3, %0, 0x1f				\n"	\
35	"	or	%0, $1, %5				\n"	\
36	"	sll	%1, %1, 0x1				\n"	\
37	"	sll	%2, %2, 0x1				\n"	\
38	"1:							\n"	\
39	"	bnez	%3, 2f					\n"	\
40	"	 sltu	%5, %0, %z6				\n"	\
41	"	bnez	%5, 3f					\n"	\
42	"2:							\n"	\
43	"	 addiu	%4, %4, -1				\n"	\
44	"	subu	%0, %0, %z6				\n"	\
45	"	addiu	%2, %2, 1				\n"	\
46	"3:							\n"	\
47	"	bnez	%4, 0b					\n"	\
48	"	 srl	%5, %1, 0x1f				\n"	\
49	"	.set	pop"						\
50	: "=&r" (__mod32), "=&r" (__tmp),				\
51	  "=&r" (__quot32), "=&r" (__cf),				\
52	  "=&r" (__i), "=&r" (__tmp2)					\
53	: "Jr" (base), "0" (high), "1" (low));				\
54									\
55	(res) = __quot32;						\
56	__mod32;							\
57})
58
59#define __div64_32(n, base) ({						\
60	unsigned long __upper, __low, __high, __radix;			\
61	unsigned long long __quot;					\
62	unsigned long long __div;					\
63	unsigned long __mod;						\
64									\
65	__div = (*n);							\
66	__radix = (base);						\
67									\
68	__high = __div >> 32;						\
69	__low = __div;							\
70									\
71	if (__high < __radix) {						\
72		__upper = __high;					\
73		__high = 0;						\
74	} else {							\
75		__upper = __high % __radix;				\
76		__high /= __radix;					\
77	}								\
78									\
79	__mod = do_div64_32(__low, __upper, __low, __radix);		\
80									\
81	__quot = __high;						\
82	__quot = __quot << 32 | __low;					\
83	(*n) = __quot;							\
84	__mod;								\
85})
86
87#endif /* BITS_PER_LONG == 32 */
88
89#include <asm-generic/div64.h>
90
91#endif /* __ASM_DIV64_H */
92